mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 2001 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#include "includes.h"
|
|
RCSID("$OpenBSD: auth2-chall.c,v 1.4 2001/03/28 22:43:31 markus Exp $");
|
|
|
|
#include "ssh2.h"
|
|
#include "auth.h"
|
|
#include "packet.h"
|
|
#include "xmalloc.h"
|
|
#include "dispatch.h"
|
|
#include "log.h"
|
|
|
|
void send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo);
|
|
void input_userauth_info_response(int type, int plen, void *ctxt);
|
|
|
|
/*
|
|
* try challenge-reponse, return -1 (= postponed) if we have to
|
|
* wait for the response.
|
|
*/
|
|
int
|
|
auth2_challenge(Authctxt *authctxt, char *devs)
|
|
{
|
|
char *challenge;
|
|
|
|
if (!authctxt->valid || authctxt->user == NULL)
|
|
return 0;
|
|
if ((challenge = get_challenge(authctxt, devs)) == NULL)
|
|
return 0;
|
|
send_userauth_into_request(authctxt, challenge, 0);
|
|
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
|
|
&input_userauth_info_response);
|
|
authctxt->postponed = 1;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo)
|
|
{
|
|
int nprompts = 1;
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
|
|
/* name, instruction and language are unused */
|
|
packet_put_cstring("");
|
|
packet_put_cstring("");
|
|
packet_put_cstring("");
|
|
packet_put_int(nprompts);
|
|
packet_put_cstring(challenge);
|
|
packet_put_char(echo);
|
|
packet_send();
|
|
packet_write_wait();
|
|
}
|
|
|
|
void
|
|
input_userauth_info_response(int type, int plen, void *ctxt)
|
|
{
|
|
Authctxt *authctxt = ctxt;
|
|
int authenticated = 0;
|
|
u_int nresp, rlen;
|
|
char *response, *method = "challenge-reponse";
|
|
|
|
if (authctxt == NULL)
|
|
fatal("input_userauth_info_response: no authctxt");
|
|
|
|
authctxt->postponed = 0; /* reset */
|
|
nresp = packet_get_int();
|
|
if (nresp == 1) {
|
|
response = packet_get_string(&rlen);
|
|
packet_done();
|
|
if (strlen(response) == 0) {
|
|
/*
|
|
* if we received an empty response, resend challenge
|
|
* with echo enabled
|
|
*/
|
|
char *challenge = get_challenge(authctxt, NULL);
|
|
if (challenge != NULL) {
|
|
send_userauth_into_request(authctxt,
|
|
challenge, 1);
|
|
authctxt->postponed = 1;
|
|
}
|
|
} else if (authctxt->valid) {
|
|
authenticated = verify_response(authctxt, response);
|
|
memset(response, 'r', rlen);
|
|
}
|
|
xfree(response);
|
|
}
|
|
/* unregister callback */
|
|
if (!authctxt->postponed)
|
|
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
|
|
|
|
userauth_finish(authctxt, authenticated, method);
|
|
}
|